XOR python script.

xorEnc.py

import os
import struct
import sys

#Single Byte XOR
def xor(data,key):
	translated = "";
	for ch in data:
		translated += chr(ord(ch) ^ key)
	return translated

#NULL Ignoring XOR Encoding
def xorIgnNullKey(data,key):
	translated = "";
	
	for ch in data:
		if ch == "\x00" or ch == chr(key):
			translated += ch
		else :
			translated += chr(ord(ch) ^ key)
	
	return translated	

#Multi-byte XOR Encoding
def four_byte_xor(content,key):
	translated = ""
	len_content = len(content)
	index = 0

	while (index < len_content):
		data = content[index:index+4]
		p = struct.unpack("I",data)[0]
		translated += struct.pack("I",p^key)
		index +=4
		pass
	return translated

out = xor ("#!4",0x40)
print out

out2 = xorIgnNullKey("hello\x00\x00\x00",0x4b)
print out2

in_file = open("resource.bin",'rb')
out_file = open("enc_resource.bin",'wb')
xor_key = 0xEAD4AA34

file_content = in_file.read()
enc_content = four_byte_xor(file_content,xor_key)
out_file.write(enc_content)
out_file.close()

enc_file = open("enc_resource.bin",'rb')
enc_file_content = enc_file.read()

dec_file = open("dec_resource.bin",'wb')
dec_file_content = four_byte_xor(enc_file_content,xor_key)
dec_file.write(dec_file_content)